Air quality monitor



FIG. 1 is a front perspective view of an air quality monitor showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the figures depict portions of the air quality monitor which form no part of the claimed design. 

CLAIM We claim the ornamental design for an air quality monitor, as shown and described. 